9,864,320
Hope this helps, let me know if there's anything else I can help you with :)
Joseph can buy 12 comic books with $32.40.
Here you have an equilateral triangle. Because of this you know that all angles are also the same as each other. We know that the angles in an equilateral triangle are 60°.
so let's set 7x + 4 = 60
Subtract 4 from both sides: 7x = 56
Divide both sides by 7: x = 8
